Endless-band grinding and polishing machine.



C. R. TOWNSEND & R. C. TURNER.

ENDLESS BAND GRINDING AND POLISHING MACHINE.

APPLICATION FILED JULY 9. 1914.

1 1 49,479 Patented Aug. 10, 1915.

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COLUMBIA PLANOURAPH CO.,\VASHINGTD|- u. u.

I C. R. TOWNSEND & R. C. TURNER.

ENDLESS BAND GRINDING AND POLISHING MACHINE.

APPLICATION FILED JULY 9.1914.

1,149,479. I Patented Aug. 10, 1915.

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C. R. TOWNSEND & R. C. TURNER ENDLESS BAND GRINDING AND POLISHING MACHINE.

APPLICATION FILED JULY 9, 1914.

3 SHEETS-SHEET 3- 1,149,479. Patented Aug. 10, 1915.

COLUMBIA PLANOGRAPH $0., WASHINGTON, u. c.

CHARLES RALPH TOWNSEND AND ROBERT CHARLES TURNER, OF BIRMINGHAM, ENGLAND.

ENDLESS-BAND GRINDING AND POLISHING MACHINE.

Specification of Letters Patent.

Patented Au 10, 1915.

Application filed July 9, 1914. Serial No. 850,045.

To all whom it may concern Be it known that we, CHARLES RALPH TOWNSEND and ROBERT CHARLES TURNER, subjects of the King of Great Britain, residing at 70 Farm street, in the city of Birmingham, England, have invented certain new and useful Improvements in Endless- Band Grinding and Polishing Machines, of which the following is a specification.

The invention relates to a grinding and polishing machine of the kind using an endless band of emery cloth, sand paper, or the like, and in which the band runs upon end rollers or drums with its upper length directly over a surface-bed disposed between the two rollers or drums.

In such a machine the invention provides an improved arrangement for adjustably carrying one of the end rollers or drums to permit of the endless band being pulled tighter and the machine easily accommodating the variations in size of the endless bands. Said improved arrangement comprises opposite swinging brackets pivoted to the machines frame and coupled across the machine by the spindle, or shaft, only of the roller or drum, but also provided with means to rigidly clamp or fix their adjustment upon the machines frame, which means may be quadrant slots and clamping The drawings show the invention.

Figure 1 is a side elevation. Fig. 2 is a plan. Fig. 3 is a left hand end elevation of Fig. 1.

The endless band which may be of emery cloth, sand paper, or any other suitable material is represented at a running upon the end rollers or drums 0 and d. The upper stretch of the endless band a runs as usual along the upper surface of the table 6 of the machines frame 6 while the under stretch is adapted to be contacted by the revolving tensioning weight f swinging from the links f 7, this weight, however, being shown out of action. The roller or drum (Z is the driver to the endless band a and the roller or drum 0 is driven by said band. The roller or drum 0} is carried upon the machines frame in fixed bearings indicated at (P. g and h are opposite swingable brackets respectively pivoted at their upper ends as at g k to rigid rearward side extensions 2' and j projecting from the table 6 of the machines frame. These end brackets g and h are provided suitably below their pivots with end supports 9 h for the spindle or shaft on of the roller or drum 0 and each end bracket is formed with a quadrant slot 12 tobe engaged by a screw bolt a serving to clamp the bracket rigidly to the frame of the machine. The spindle or shaft m of the roller 0 couples the two brackets g and it across the machine. Said roller 0 is illustrated in the drawings in its closest postion to the roller d and with its highest point at an elevation slightly below that of the upper face of the table 6 If the two clamping nuts 12, are loosened the roller a swinging rearwardly in the arc of a circle with the brackets g and 71, will be bodily moved farther away from the roller 45 to either tighten the endless band a already on the machine or accommodate a longer band within the limits for which the slots 11, n are provided, said roller 0 after being adjusted being again clamped rigidly to the machines frame 6, by tightening up the bolts 7%.

The length of the slots at is so selected that the roller 6 shall have a range of adj ustable movement amply sufficient for practical purposes, but said roller even when adj usted at the greatest distance from the roller (Z shall not have its highest point above or substantially above the upper surface of the table 6 The rollers or drums 0 and d have ball bearings upon their supports as also has the revolving tensioning weight f but these features are ordinary.

The band is indicated in dotted lines in Fig. 2.

Having now particularly described our invention what we claim and desire to secure by Letters Patent is In an endless band grinding and polishing machine, the combination with a machine frame, a table forming a part of said frame, a pair of rollers located adjacent the ends of said table, and an endless polishing band trained over said rollers, the table having extensions arms at one end thereof, of a pair of brackets pivoted to said arms and below their pivots formed with bearings for the shaft of one of said rollers, the brackets also having arcuate slots, and binding screws passing through the slots and threaded into the machine frame for holding the brackets at desired adjustments, the length of the slots being selected to provide for an ample range set our hands in presence of two subscribing of adjustment of the roller carried by said witnesses. brackets, but to prevent said roller, in the CHARLES RALPH TOWNSEND. p0s1t10n thereof most distant from the other 4 roller, from having its highest vpoint at an ROBERT CHARLES TURNER elevation above or substantially above the Witnesses: upper surface of said table. GEO. FUERY,

In testimony whereof We have hereunto BERNARD H. TINGLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

